Fragmentation of displacement cascades into subcascades: A molecular dynamics study

被引：22

作者：

Antoshchenkova, E. ^{[1
]}

Luneville, L. ^{[2
,3
]}

Simeone, D. ^{[1
,3
]}

Stoller, R. E. ^{[4
]}

Hayoun, M. ^{[5
]}

机构：

[1] CEA, CNRS CEA ECP, CEN Saclay, DEN,SRMA,LA2M, F-91191 Gif Sur Yvette, France

[2] CEA, CNRS CEA ECP, CEN Saclay, DEN,SERMA,LLPR, F-91191 Gif Sur Yvette, France

[3] Ecole Cent Paris, CNRS CEA ECP, Lab SPMS, F-92292 Chatenay Malabry, France

[4] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[5] Ecole Polytech, CNRS, CEA DSM, Lab Solides Irradies, F-91128 Palaiseau, France

来源：

JOURNAL OF NUCLEAR MATERIALS | 2015年 / 458卷

关键词：

PRIMARY DAMAGE CREATION; COMPUTER-SIMULATION; RECOIL ENERGY; COLLISION CASCADES; DEFECT PRODUCTION; RADIATION-DAMAGE; METALS; COPPER; FCC; IRRADIATION;

D O I：

10.1016/j.jnucmat.2014.12.025

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The fragmentation of displacement cascades into subcascades in copper and iron has been investigated through the molecular dynamics technique. A two-point density correlation function has been used to analyze the cascades as a function of the primary knock-on (PKA) energy. This approach is used as a tool for detecting subcascade formation. The fragmentation can already be identified at the end of the ballistic phase. Its resulting evolution in the peak damage state discriminates between unconnected and connected subcascades. The damage zone at the end of the ballistic phase is the precursor of the extended regions that contain the surviving defects. A fractal analysis of the cascade exhibits a dependence on both the stage of the cascade development and the PKA energy. This type of analysis enables the minimum and maximum displacement spike energies together with the subcascade formation threshold energy to be determined. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：168 / 175

页数：8

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